Blue azo dye.



UNITED s'rsrns PATENE QFFIQE.

CARL HEIDENREICH, or: vonWiNKEL, NEAR ELBERFELD, GERMANY, AssIcNoR '10 FAPv BENFABRIKEN vomr. Fins-DR. BAYER & 00., or ELBEnrsLe, GERMANY, A CORPORA- TION OF GERMANY.

BLUE A20 DYE.

peoifioetioio ct Letters Patent.

Patented June 30, 1908.

Application filed Hui-ch 10, 198%,, Serial 1505420350.

(R standing foroilzyl) with i:8:3zodioxynpphthalene disullonic acid (chrometropic acid). i I

The hitherto unkncwn'p" ciiloro-diallrylenilins ZtI'tB ob d by reducmg 'flifinitroswcompounds ul meta-chlorodielllyliuiilins. The chloro-dinlcthylsnilin forms crystals melting at 42 G. The puro-aminoflncto-chloro-diethylzinilin is it colorless limpid oil which darkens on being kept. It boils at 285C. under a pressure of 7 60 mm.

T he new dyestufl's are afterbeing dried and pulverized dork powders soluble in water with a blue color and dyeing Wool from acid baths blue shades. Thlev yield upon reduction with stsnoous chlorid and hydrochloric acid perm amino rnetnchloro dalkylsnilin and 2-einino-l.S-dioxynuphtl1alene-3.fi-disuli'onicacid.

' In carrying out my invention practically i can )roceed as follows, the parts being y wcig t: 20 ports of para-amino-mcto--chlorodiethylanilin are diazotized with 10 "units of hydrochloric acid and 6.9 ports of so ium nitrite and the diazo-compound is introduced into acoolcd solution of 36.2 ports of the neutral sodium salt of chromotropic acid (i :S-dioxynophtholene-3.6disulfonic acid) in 360 parts of water and 8 parts of sodium hydroxid. Then 40 nurts of caustic soda. lye of 25% are added. ilhe formation of the dye stuii is complete after it short time and on acidulation with hydrochloric acid the dye itu'lfdis precipitated. It is filtered oil' and 1'16 1 pars uniino mete The new dyestuii is site!) being dried and pub-'erized a dark brown powder soluble in Water with a. blue color and soluble in concentrated sulfuric acid with n reddish-violet colon It dyes wool from acid baths pure blue shades fast to sllmlies and to light. Upon reduction with stzinnous chlorid and livdrochloric acid it yields puraemino-metm cliloro-diethylunilin and Z-omino-LS-dioxynaphthalene-3.fi disulfonic ucid.

'lho process is carried out in an analogous manner on starting from other puraaminometo,chloro'dioikyhinilins a. g. the paire- 11min 0 -met..-chiorr. -dimeth-ylsnilin etc.

lieving now described my invention and in what manner the some is to be performed, What i claim is 1. The hereiddosoribed new blue monoaxpodyestutls, obtainable by combining the disxocompound sot punt-innino-meta-ohlorodisllryleniline with chronwtropic acid, which dyestuffs are after being dried and p'ulvep izod-dark powders soluble in water with a blue color; yielding upon reduction with stnnnous clilorid and hydrochloricacid pumnmino meta chloro diullrylsnilin and 2- eniino- 1 dioxynophthulene-Li .6: disulfonic acid and dyeing wool from acid baths blue shades, substantially as dcscri bed.

'2. The herein-described new azodyestuff obtainable by combining the diozocompound of piwsmmimumxotu-chloro-diethylanilin with 1.8 dinxynephtlmlenc 3.6 disulionic acid, which dye ii is after being dried {1nd pulvcrizod is dark brown powder soluble in hot Water with a blue color and soluble in concentrated sulfuric acid with a reddish-violet color ielding upon reduction with stannous ohlorid chlo1'o diethylanilin and Z-amino-lfi-dioxy- Witnesses.

m 1: HEEDENRE ICH.

Witnesses OTTO home,

Home. Wren-ore.

and hvdrochloric acid pars. amino meta-- 

